The Armor of Kings

The Armor of Kings is a magical Plate Mail that was kept by the elves in secret for years. We do not currently know a lot about it, except that it manifests a helmet when the wearer needs it, protects from most injuries, projects a shield with a lion as a coat of arms, and allows The Sword of Kings to be stuck to its back without a sheath. On it's breastplate1 we can see a Lion conquering a Dragon.